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The LCM of the given numbers is the product of all different prime factors to their greatest power. If there are no exponents, the greatest power of the prime factors is 1 and each different prime factor is used in the multiplication:
prime factors of 15 are 3 x 5;
prime factors of 21 are 3 x 7;
the LCM of 15 and 21 is 3 x 5 x 7 = 105
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What is the prime factorization of the composite number 42?
42=2x21 21=3x7 PF=2x3x7 The PF (Prime Factorization) of 42 is 2x3x7.(Sorry, I couldn't do a factor tree, there are always helpful to use when doing prime factorization, but since this is the computer, I could only do it like the following above.)
Is the prime number 21 is a prime number?
21 is a composite number, not a prime, having prime factors 3x7.
What prime number comes after 19?
23 Prime numbers are odd numbers and 21=3x7
What is the smallest prime number that is greater than 20?
21 = 3x7 ... not prime. 22 = 2x11 ... not prime. 23 is prime. 23.
Is 21 prime or not prime?
21 = 3x7, and so is not prime, as it can be expressed as the product of multiple prime numbers
What is the prime factorizatiion of 21?
The prime factorization for 21 is 3x7.
What is the prime factorization of the composite number 42?
42=2x21 21=3x7 PF=2x3x7 The PF (Prime Factorization) of 42 is 2x3x7.(Sorry, I couldn't do a factor tree, there are always helpful to use when doing prime factorization, but since this is the computer, I could only do it like the following above.)
Is the prime number 21 is a prime number?
21 is a composite number, not a prime, having prime factors 3x7.
What is the factor tree of 21?
3x7=21 3 and 7 are prime numbers, so 3x7 is the factor tree of the number 21.
What prime number comes after 19?
23 Prime numbers are odd numbers and 21=3x7
What is the smallest prime number that is greater than 20?
21 = 3x7 ... not prime. 22 = 2x11 ... not prime. 23 is prime. 23.
How do you make 29 using 4 3s?
3x7+4x2
Is 21 prime or not prime?
21 = 3x7, and so is not prime, as it can be expressed as the product of multiple prime numbers
Why is 21 not a prime number?
21 isn't a prime number because it has more factors than just itself and 1 3x7=21 21x1=21
What are the prime number between 20 and 40 only?
21 = 3x7 23 = prime 25 = 5x5 27 = 3x9 29 = prime 31 = prime 33 = 3x11 35 = 5x7 37 = prime 39 = 3x13
What does 3x7 equal?
3x7 = 21
What is the least common multiple of 9 15 and 21?
Prime factorization of 9 = 3x3Prime factorization of 21 = 3x7Prime factorization of 35 = 5x73 is common in P.F. of both 9 and 21. 7 is common in P.F. of both 21 and 35.L.C.M. = Multiplication of common numbers x Multiplication of uncommon numbers L.C.M. = 3x7(common numbers) x 3x5(uncommon numbers) = 21x15 = 315
